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Exclusive Sing-Off Sneak Peek: Nick Lachey and Jewel Duet (and Dance!) to "It Had to Be You"

Thanks to her impressive musical knowledge and her easygoing charm, Jewel has had no trouble fitting in on this season of The Sing-Off. But it seems no one has taken to Season 4's new addition more than...

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Kate Stanhope

Thanks to her impressive musical knowledge and her easygoing charm, Jewel has had no trouble fitting in on this season of The Sing-Off.

But it seems no one has taken to Season 4's new addition more than host Nick Lachey.

The best performances of 2013

In this exclusive sneak peek from Monday's season finale (8/7c, NBC), Lachey reflects on their "magical season together" before busting into a swoon-worthy performance of "It Had to Be You." And Jewel is so moved by his efforts, she takes the stage and makes it a duet!

To hear what kind words Jewel had for Lachey and his dimples, and to see their impressive dance moves, check out the heartwarming clip below:

The Sing-Off airs Wednesday at 8/7c on NBC. The Season 4 finale airs Monday at 8/7c.